title: Shear bond strength of an experimental composite bracket.
abstract: OBJECTIVE
  The in vitro shear bond strength of MZ100 brackets (an experimental composite bracket developed by the Dental Biomaterial Laboratory at Boston University) and the effect of different treatment methods on these brackets were evaluated.
  
  
  METHODS
  As the bonding substrates, 80 Vitablocs® Mark II (Vident, Brea, CA, USA) were chosen. Three treatment methods were employed on 60 MZ100 bracket bases (20 brackets per treatment): silane coupling agent (Porcelain Primer; Ormco, Orange, CA, USA), sandblasting (Basic Professional Model Sandblaster; Renfert GmbH, Germany), and non-treatment. Two different orthodontic adhesives were also used: Blugloo™ (Ormco, Orange, CA, USA) and Enlight™ (Ormco, Orange, CA, USA). Twenty metal brackets were used as controls. Shear bond strength tests were performed after sample preparation and bracket bonding.
  
  
  RESULTS
  The mean shear bond strength of non-treated MZ100 brackets bonded with Enlight™ had the lowest value (7.9 MPa), while that of sandblasted MZ100 brackets bonded with Blugloo™ showed the highest value (17.9 MPa). The mean shear bond strength of non-treated MZ100 brackets was significantly lower than that of the other groups (p<0.05). The mean shear bond strength of sandblasted MZ100 brackets bonded with Blugloo™ was significantly higher than that of those bonded with Enlight™ (p<0.05). With the exception of the silane-Blugloo™ group, the treated MZ100 brackets demonstrated shear bond strengths that did not significantly differ from metal brackets.
  
  
  CONCLUSIONS
  The use of sandblasting and silane coupling agent significantly increases the shear bond strength of the MZ100 brackets to values resembling those of metal brackets.
authors.affiliation: Department of Orthodontics, Ninth People's Hospital, Shanghai Jiao Tong University, School of Medicine, Room 213, Building No.1, Zhi-Zao-Ju Road, 639, Shanghai, China.
authors.forename: Zhe-chen
authors.initials: ZC
authors.lastname: Zhang
authors.forename: Russell
authors.initials: R
authors.lastname: Giordano
authors.forename: Gang
authors.initials: G
authors.lastname: Shen
authors.forename: L Lee
authors.initials: LL
authors.lastname: Chou
authors.forename: Yu-fen
authors.initials: YF
authors.lastname: Qian
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000268:Adhesiveness; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods*; D003738:Dental Cements / Q000737:chemistry*; D045662:Dental Etching / Q000379:methods*; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D019544:Equipment Failure Analysis; D017276:Friction; D006801:Humans; D016910:Orthodontic Brackets; D010865:Pilot Projects; D011140:Polyurethanes / Q000737:chemistry*; D033081:Shear Strength; D012821:Silanes / Q000737:chemistry; D013499:Surface Properties; D013718:Tensile Strength
chemical_list: D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D003738:Dental Cements; D011140:Polyurethanes; D012821:Silanes